On Monday 25 April 2016 13:19:13 andy pugh wrote: > On 25 April 2016 at 18:03, Gene Heskett <[email protected]> wrote: > > But at that diameter, > > best done on the mill as the drive parts at that diameter would be > > falling out in pieces as the 1 HP motor breaks them. BTDT, way too > > many times already. > > My version of a drive system on my 9x lathe has been bullet-proof so > far. I do sometimes miss having a back-gear option, though. > > Not a great photo, but I basically just put a big V-belt pulley on the > spindle and let the VFD do the rest. > https://picasaweb.google.com/108164504656404380542/CNCUnsorted#5437112 >986322828066
I have considered something along those lines but the treadmill motors pulley is part of the cooling fan/flywheel using a j size polygroove belt 5 ribs wide and I have been unable to locate, or make a big enough matching pulley to do that as I've been unable to find/buy a tool holder with the correct geometry to hold one of the very long v-chips in a position to carve it. All centered, side of tool holder is in the way when cutting the left most groove. What sort of an encoder is hidden under it? The treadmill motors can pull stumps without using any of Alfred N's Finest, so low speed grunt is generally not a problem, particularly since the jackshafts polygroove pulley is already a 3x speed stepdown. But I think it would solve all my broken drive parts problems in one swell foop at the expense of losing the backgearing. Its a bit puny anyway even with steel gears in it now-a-days. One of the tool tipped over and locked the spindle in 5 degrees from 500 rpms incidents bent a backshaft. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Find and fix application performance issues faster with Applications Manager Applications Manager provides deep performance insights into multiple tiers of your business applications. It resolves application problems quickly and reduces your MTTR. Get your free trial! https://ad.doubleclick.net/ddm/clk/302982198;130105516;z _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
